CN115093371B - Caprolactam sheeting production process - Google Patents
Caprolactam sheeting production process Download PDFInfo
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- CN115093371B CN115093371B CN202210905081.4A CN202210905081A CN115093371B CN 115093371 B CN115093371 B CN 115093371B CN 202210905081 A CN202210905081 A CN 202210905081A CN 115093371 B CN115093371 B CN 115093371B
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- rotary drum
- scraper
- caprolactam
- machine
- flaker
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- JBKVHLHDHHXQEQ-UHFFFAOYSA-N epsilon-caprolactam Chemical compound O=C1CCCCCN1 JBKVHLHDHHXQEQ-UHFFFAOYSA-N 0.000 title claims abstract description 156
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 238000004806 packaging method and process Methods 0.000 claims abstract description 61
- 230000007246 mechanism Effects 0.000 claims abstract description 34
- 239000007787 solid Substances 0.000 claims abstract description 34
- 239000007788 liquid Substances 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 33
- 239000000463 material Substances 0.000 claims abstract description 24
- 238000005303 weighing Methods 0.000 claims abstract description 20
- 239000002826 coolant Substances 0.000 claims abstract description 19
- 238000007789 sealing Methods 0.000 claims abstract description 14
- 238000007493 shaping process Methods 0.000 claims abstract description 11
- 238000011049 filling Methods 0.000 claims abstract description 4
- 238000004140 cleaning Methods 0.000 claims description 42
- 230000008569 process Effects 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 239000004744 fabric Substances 0.000 claims description 14
- 238000003860 storage Methods 0.000 claims description 14
- 239000000843 powder Substances 0.000 claims description 13
- 238000005520 cutting process Methods 0.000 claims description 9
- 239000000919 ceramic Substances 0.000 claims description 5
- 239000002131 composite material Substances 0.000 claims description 5
- 238000005452 bending Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 6
- 238000007790 scraping Methods 0.000 description 12
- 239000011344 liquid material Substances 0.000 description 11
- 230000009471 action Effects 0.000 description 9
- 230000005540 biological transmission Effects 0.000 description 5
- 239000000428 dust Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000013064 chemical raw material Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000012785 packaging film Substances 0.000 description 1
- 229920006280 packaging film Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D223/00—Heterocyclic compounds containing seven-membered rings having one nitrogen atom as the only ring hetero atom
- C07D223/02—Heterocyclic compounds containing seven-membered rings having one nitrogen atom as the only ring hetero atom not condensed with other rings
- C07D223/06—Heterocyclic compounds containing seven-membered rings having one nitrogen atom as the only ring hetero atom not condensed with other rings with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
- C07D223/08—Oxygen atoms
- C07D223/10—Oxygen atoms attached in position 2
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D201/00—Preparation, separation, purification or stabilisation of unsubstituted lactams
- C07D201/16—Separation or purification
Abstract
The invention discloses a caprolactam sheeting production process method. The method comprises the following steps: the liquid caprolactam is conveyed into a cavity between a shell of the rotary drum flaker and the rotary drum, a cooling medium is filled in the rotary drum, the liquid caprolactam is adhered to the surface of the rotary drum when the rotary drum rotates, the material adhered to the outer surface of the rotary drum is cooled to a solidifying point and solidified through the temperature difference between the material on the outer surface of the rotary drum and the cooling medium in the rotary drum, and the solid caprolactam on the surface of the rotary drum is scraped in a sheet form through a scraper when the rotary drum rotates to the scraper position of the rotary drum flaker; weighing caprolactam slices scraped by the scraper and filling the caprolactam slices into a packaging bag; the packaging bag with the knots is conveyed on a conveying belt, and is sequentially sealed by a heat-sealing machine, the packaging bag is inverted by a bag inverting mechanism, the weight rechecking is carried out by a weight rechecking machine, unqualified products are removed by an automatic removing machine, the vibration shaping is carried out by an automatic vibration shaping machine, and the conveying is carried out by an unpowered conveyor. The method has the advantages of uniform flaking and low energy consumption.
Description
Technical Field
The invention relates to a caprolactam sheeting production process method, and belongs to the technical field of caprolactam sheeting.
Background
Caprolactam is an important organic chemical raw material, and is mainly used as a monomer raw material for industrial spinning, plastic modification, palm fiber, fishing net wire, conveyor belt core, injection molding, food packaging film and the like. Caprolactam raw materials are generally liquid, special vehicles are required to transport, the transportation cost is high, and transportation safety hazards exist. In order to avoid the problem of storing and transporting a large amount of liquid caprolactam, the liquid caprolactam is quickly cooled and converted into solid knots, and the low-cost public engineering which is convenient and easy to obtain enables the low-cost production of knots.
At present, the domestic traditional caprolactam sheeting technology generally adopts a rotary drum sheeting machine, the sheeting machine has import and domestic production, and a plurality of defects exist in the current caprolactam sheeting production: some flakers adopt an upper feeding mode, liquid feed liquid is sprayed on the surface of a rotary drum, the rotary drum is cooled by a cooling sleeve arranged in the rotary drum, the uneven flaking of materials is easy to occur in the production process, the requirement on the cooling temperature is high, and the consumption of chilled water is high; the scraper adopted by the existing rotary drum flaker is mostly of a straight structure, the cutting edge of the scraper is parallel to the surface of the rotary drum, when solid flaking is scraped, the scraper needs to bear larger load, the failure rate of a scraper system is high, the maintenance cost is high, the power requirement of the scraper structure on the rotary drum motor is also high, the energy consumption of the whole system is high, the gap adjustment of the scraper is difficult, the required precision is high, and the transmission is unstable easily.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a caprolactam sheeting production process method with uniform sheeting, low energy consumption.
The invention is realized by the following technical scheme: a caprolactam caking production process method is characterized in that: the method comprises the following steps:
(1) The liquid caprolactam is conveyed into a cavity between a shell of the rotary drum flaker and the rotary drum through a conveying pump, the lower part of the rotary drum flaker is contacted with the liquid caprolactam in the cavity, a cooling medium is filled in the rotary drum of the rotary drum flaker, the liquid caprolactam is adhered to the surface of the rotary drum when the rotary drum of the rotary drum flaker rotates, the material adhered to the outer surface of the rotary drum is cooled to a solidifying point and solidified through the temperature difference between the material on the outer surface of the rotary drum and the cooling medium in the rotary drum, and when the rotary drum continuously rotates to a scraper position of the rotary drum flaker, the solid caprolactam on the surface of the rotary drum is scraped in a sheet form through a scraper;
(2) Feeding caprolactam slices scraped by the scraper into a double-screw automatic weighing packaging machine for weighing, and filling the weighed slices into a packaging bag;
(3) Conveying the packaging bags with the knots on a conveying belt, and sealing the packaging bags through a heat-sealing machine;
(4) The sealed packaging bag is continuously conveyed forwards through a conveying belt and sequentially passes through a bag pouring mechanism, a weight rechecking machine, an automatic removing machine, an automatic vibration shaping machine and an unpowered conveyor, wherein the bag pouring mechanism converts the packaging bag from a vertical state to a flat state, the weight rechecking machine rechecks the weight of the packaging bag, the automatic removing machine removes unqualified packaging bags from the conveying belt, and the automatic vibration shaping machine performs vibration shaping on the qualified packaging bag.
In the invention, caprolactam liquid material enters a cavity between a rotary drum and a shell, the lower part of the rotary drum flaker is contacted with liquid caprolactam in the cavity, and a cooling medium is introduced into the rotary drum. When the rotary drum rotates under the action of power, the material is carried out from the liquid material pool along with the uniform rotation of the surface of the rotary drum by utilizing the tension of the surface of the material liquid and the adhesion between the material and the surface of the rotary drum, a layer of film product with uniform thickness is formed on the outer surface of the rotary drum, and the temperature of the material is rapidly cooled to a solidifying point and solidified through the temperature difference between the material on the outer surface of the rotary drum and a cooling medium in the rotary drum. When the rotary drum rotates to the scraper position, scraping off the film product solidified into solid in a sheet form through the scraper, conveying the scraped sheet product into a double-screw automatic weighing packaging machine for weighing, and filling the weighed knots into a packaging bag; the packaging bag is sealed through the heat-sealing machine, then when the packaging bag is conveyed on the conveying belt, the packaging bag is converted into a flat-lying state from a vertical state through the bag pouring mechanism, the weight of the packaging bag is rechecked through the weight rechecking machine, the unqualified packaging bag is removed from the conveying belt through the automatic removing machine, and the qualified packaging bag is subjected to vibration shaping through the automatic vibration shaping machine. The wrapping bag is at the conveyer belt end through the manual work pile up neatly. The sheeting mode of the rotary drum sheeting machine can form film products with uniform thickness on the surface of the rotary drum, reliable temperature difference can be formed between materials on the outer surface of the rotary drum and cooling mediums in the rotary drum by introducing chilled water into the rotary drum, the chilled water consumption is low, products with uniform granularity can be formed, meanwhile, the film products formed on the surface of the rotary drum are uniform in thickness, stress is uniform when a scraper is scraped, and faults of a scraper system can be reduced.
Furthermore, in order to facilitate crystallization of the materials, a hot water system is adopted to carry out heat tracing when the liquid caprolactam is conveyed into the rotary drum flaker from the storage tank, the hot water temperature is 90 ℃, and the temperature of the liquid caprolactam is 80-85 ℃.
Further, the cooling medium is chilled water or cold air; in the step 1, the cavity between the shell of the rotary drum flaker and the rotary drum is filled with dry air. When the chilled water is used as a cooling medium, the chilled water is introduced into the inner cavity of the rotary drum sheeting machine to cool the rotary drum. When the cooling medium is cold air, the ultralow temperature cold air can enable the liquid caprolactam to be instantaneously crystallized. And dry air is introduced into the cavity, so that the caking pieces can be prevented from being bonded together, and the solid caking pieces are discharged and are subjected to subsequent treatment.
Further, the scraper of the rotary drum flaker is spiral consistent with the curved surface of the rotary drum, the enveloping degree of the scraper to the rotary drum is 150-180 degrees, the lower end of the scraper is positioned at one side of a discharge hole of the rotary drum flaker, the scraper is a single-sided cutting edge, the cutting edge is higher than the inner surface of the scraper, and the inner surface of the scraper is made of ceramic composite materials. The scraper adopts the spiral structure, when the scraper scrapes the film product on the surface of the rotary drum, the whole edge surface of the scraper does not operate simultaneously, the edge surface of the scraper contacts with the film product on the surface of the rotary drum sequentially to scrape, the scraper is stressed little in the scraping process, the transmission is stable, the failure rate of the scraper can be reduced, meanwhile, the structural design can reduce the energy consumption, the power requirement on the rotary drum motor can be reduced, and the effects of saving energy and reducing abrasion are achieved. The scraper adopts a design that a single-sided cutting edge is higher than the inner surface of the scraper, so that the solid initial caking piece is convenient to be free from sticking to the scraper and the solid caking piece can naturally slide down; the inner surface of the scraper is made of ceramic composite material, the smoothness of the inner surface of the cutter is high, and the solid initial caking piece can be ensured to smoothly slide to the lowest part under the action of self gravity.
Further, when the scraper scrapes off the solid caprolactam on the surface of the drum, the solid caprolactam is sequentially contacted with the film product on the surface of the drum from the upper end to the lower end for scraping. When the edge surface of the scraper is contacted with the film product on the surface of the rotary drum from the upper end to the lower end in sequence, the scraper is stressed little in the scraping process, the transmission is stable, the failure rate of the scraper can be reduced, the power requirement on the rotary drum motor can be reduced, and the effects of saving energy and reducing abrasion are achieved.
Furthermore, in order to facilitate the packing machine to obtain qualified granularity products, the caprolactam slices scraped by the scraper are firstly sent into a bin arranged on the upper part of the double-screw automatic weighing packing machine to be crushed and filtered, and the qualified granularity caprolactam powder is then sent into the double-screw automatic weighing packing machine to be weighed.
Further, be provided with reducing mechanism and screen cloth in the feed bin, the screen cloth sets up in reducing mechanism's lower part, and reducing mechanism includes the roller sword that drives the rotation by the motor, is provided with at least one helical blade along its axial interval on the cutter arbor of roller sword, every helical blade has two and is the heliciform blade that 180 degrees contained angles set up, and the rotation of two blades is unanimous, and the difference in height that two blades were located, and the blade has the radian of downwarping or upwards bending. The sheet products with uneven sizes scraped by the scraper can be crushed into powder with proper granularity by the roller knife of the crushing device, and the powder products with qualified granularity can be screened out by the screen mesh and then weighed. The structural design of the spiral blade of the roller blade can enable the roller blade to fully crush caprolactam solid knots through the spiral blade when the roller blade rotates, two blades at different heights can crush solid knots at different heights, and the roller blade can crush knots at the upper part for a plurality of times along with falling of knot powder with qualified granularity of a filter screen part, and the bent blades can enable the solid knots to form turbulent flow in the rotating process, so that the crushing effect and the crushing efficiency of the solid knots can be increased.
Further, caprolactam caking piece scraped by the scraper directly falls into the bin for crushing treatment. The initial solid-state caking piece scraped by the scraper can directly enter the bin for crushing under the action of the spiral scraper, a feeding mechanism for conveying the scraped caking piece into the bin is not required to be arranged, the feeding step is omitted, equipment configuration can be saved, and meanwhile, the energy-saving effect can be realized.
Further, the screen cloth rotationally sets up in the feed bin, and the screen cloth is omega shape, and the rotation direction of screen cloth is opposite with the rotation direction of roller sword, when the roller sword rotates, the screen cloth counter-rotates simultaneously. When the rotation direction of the screen cloth is opposite to that of the roller blade, the solid initial caking piece naturally forms spiral flow in the screen cloth, at the moment, the blades of the roller blade can easily crush the solid initial caking pieces with different sizes, and the caking piece powder with qualified granularity can quickly enter the storage bin under the action of centrifugal force to wait for the next calculation bagging operation.
Further, a cleaning mechanism is arranged on the scraper, the cleaning mechanism comprises a cleaning motor, a gear driven by the cleaning motor and a scraper blade, a rack and a limiting guide plate are arranged at the outer side end of the scraper blade, a guide groove is formed in the limiting guide plate, one end of a motor shaft of the cleaning motor is movably arranged in the guide groove of the limiting guide plate, the gear is connected with a rotor of the cleaning motor into a whole, the gear is meshed with the rack, the other end of the cleaning motor is supported in a bearing shell through a bearing, an auxiliary supporting rod is arranged at the lower part of the bearing shell, one end of a scraper blade connecting rod is fixedly connected with the end face of the bearing shell, the other end of the scraper blade connecting rod is connected with the scraper blade through an electric cylinder, and the scraper blade can be contacted with the inner surface of the scraper blade; when the cleaning motor rotates forwards, the electric cylinder stretches to enable the scraping plate to move to the lower end to be in contact with the scraping plate to clean the surface of the scraping plate, when the cleaning motor rotates backwards, the electric cylinder shortens, and the scraping plate moves upwards to be separated from the surface of the scraping plate, so that cleaning is not performed.
The beneficial effects of the invention are as follows: the invention adopts the mode that the lower part of the rotary drum is immersed into liquid materials to rotate so as to drive the materials to be attached to the surface of the rotary drum, and cooling medium is introduced into the inner cavity of the rotary drum to crystallize and solidify the liquid materials, so that the requirement on cooling temperature is low, and the energy consumption can be greatly reduced; the sheeting mode of the rotary drum sheeting machine can form film products with uniform thickness on the surface of the rotary drum, the stress is uniform when the scraper scrapes, and the faults of the scraper system can be reduced; according to the scraper structure adopted in the invention, when a film product on the surface of the rotary drum is scraped, the whole edge surface of the scraper does not work simultaneously, the edge surface of the scraper is contacted with the film product on the surface of the rotary drum from the upper end to the lower end in sequence for scraping, the stress of the scraper is small in the scraping process, the transmission is stable, the failure rate of the scraper can be reduced, and meanwhile, the energy consumption can be reduced; the invention adopts the public engineering with low cost, which is convenient and easy to obtain, and can greatly reduce the production cost.
Drawings
FIG. 1 is a flow chart of the production process of the present invention;
FIG. 2 is a schematic view of a production facility of a caprolactam sheeting production line;
FIG. 3 is a schematic diagram of a rotary drum sheeting machine in accordance with the present invention;
FIG. 4 is a schematic view of the doctor blade arrangement of the rotary drum flaker of the present invention;
FIG. 5 is a schematic cross-sectional view of a doctor blade in the invention;
FIG. 6 is a front view of a roller blade (with a helical blade) in accordance with the present invention;
FIG. 7 is a schematic perspective view of a roller blade (with two helical blades) in accordance with the present invention;
FIG. 8 is a schematic view in the direction A of FIG. 1;
FIG. 9 is a schematic view of a second arrangement of doctor blades and bins of the rotary drum flaker of the present invention;
FIG. 10 is a schematic view of the structure of a second screen in accordance with the present invention;
FIG. 11 is a schematic view of the present invention with a cleaning mechanism;
FIG. 12 is a schematic transmission of the sweeping mechanism of FIG. 11;
FIG. 13 is a schematic view of the connection between the cleaning mechanism and the scraper in FIG. 11;
in the figure, 1, a rotary drum flaker, 2, a feeding screw, 3, a double-screw automatic weighing packaging machine, 4, an automatic heat sealing machine, 5, a main belt conveyor, 6, an automatic bag pouring conveyor, 7, a slope conveyor, 8, a weight rechecking machine, 9, an automatic rejecting machine, 10, an automatic vibration flattening conveyor, 11, an unpowered conveyor, 12, a refrigerator, 13, a raw material storage tank, 14, a storage bin, 15, a roller blade, 16, a screen, 17, a motor of a smashing device, 18, a motor of the screen, 19, a dust remover, 20 and a water pump;
1-1 parts of a shell, 1-2 parts of a rotary drum, 1-3 parts of a scraper, 1-4 parts of a rotary drum driving motor, 1-5 parts of a rack, 1-6 parts of a limit guide plate; 21. 21-1 parts of cleaning mechanism, 21-2 parts of cleaning motor, gear, 21-3 parts of scraper, 21-4 parts of electric cylinder, 21-5 parts of electric cylinder controller ECU,21-6 parts of motor TCU,21-7 parts of bearing, 21-8 parts of bearing shell, 21-9 parts of scraper connecting rod, 21-10 parts of auxiliary supporting rod; 15-1, spiral blade.
Detailed Description
The invention is further illustrated by the following non-limiting examples, in conjunction with the accompanying drawings:
a caprolactam caking production method, the production process flow of which is shown in figure 1, mainly comprises: caprolactam storage tank, sheeting machine, double-screw automatic weighing packaging machine, automatic heat sealing machine, main belt conveyor, automatic bag pouring conveyor, slope conveyor, weight rechecking machine, automatic rejecting machine, automatic vibration flattening conveyor, unpowered conveyor and manual stacking.
As shown in figure 2, the production equipment of the caprolactam sheeting production line is schematically shown. The production line equipment mainly comprises: the automatic rotary drum flaker 1, the double-screw automatic weighing and packaging machine 3, the automatic heat sealing machine 4, the main belt conveyor 5, the automatic bag pouring conveyor 6, the slope conveyor 7, the weight rechecking machine 8, the automatic removing machine 9, the automatic vibration flattening conveyor 10, the unpowered conveyor 11, the dust removal system and public works. Utilities mainly include chilled water systems, steam systems, dry air systems, and the like. The liquid caprolactam is cooled and flaked into solid caprolactam, and is packaged into bags (25 KG/bag), and the film is piled and wound.
As shown in fig. 3 to 5, the drum sheeting machine 1 is schematically structured. The rotary drum sheeting machine 1 is used to convert liquid caprolactam into solid caprolactam. The rotary drum sheeting machine 1 comprises a shell 1-1, a rotary drum 1-2 rotatably arranged in the shell 1-1, and a scraper 1-3 arranged in the shell 1-1 corresponding to the outer surface of the rotary drum 1-2. The shell 1-1 is provided with a feed inlet and a discharge outlet, and the feed is controlled by a feed control valve. The rotary drum 1-2 is provided with an inner cavity, a cavity is formed between the rotary drum 1-2 and the shell 1-1, a liquid material pool is arranged between the lower part of the rotary drum 1-2 and the shell 1-1 and is used for containing caprolactam liquid materials, and the material level is controlled by a radar level gauge. The rotary drum 1-2 is driven to rotate by a rotary drum driving motor 1-4, and the rotation of the rotary drum 1-2 is controlled by a PLC and a frequency converter. The inner cavity of the rotary drum 1-2 is filled with cooling medium to form temperature difference inside and outside the rotary drum, so that the temperature of the materials outside the rotary drum is rapidly cooled to a solidifying point and solidified. In this embodiment, chilled water is introduced into the inner cavity of the rotary drum 1-2, a nozzle is arranged in the inner cavity of the rotary drum 1-2 and is connected with a chilled water system, a liquid level sensor for detecting the water level of the chilled water is arranged in the inner cavity of the rotary drum 1-2, and the starting of the water pump 20 of the chilled water system is controlled through a liquid level signal. The scraper 1-3 is in a spiral shape consistent with the curved surface of the rotary drum 1-2, the scraper 1-3 is fixedly connected with the flaker shell, the lower end of the scraper 1-3 is positioned at one side of the discharging hole of the shell 1-1, a certain gap is reserved between the scraper 1-3 and the surface of the rotary drum 1-2, and the enveloping degree of the scraper 1-3 on the rotary drum 1-2 is 150-180 degrees. Preferably, the gap between the scraper 1-3 and the surface of the rotary drum 1-2 can be adjusted, and the adjustment of the scraper gap can be realized by adopting strip-shaped holes for mounting holes on a bracket for mounting the scraper 1-3. The scraper 1-3 adopts a single-sided cutting edge, the cutting edge adopts a hard alloy cutter, and a diamond-like coating is deposited on the surface, so that the scraper has stronger abrasion resistance and longer service life; the cutting edge of the scraper 1-3 is higher than the inner surface of the scraper, so that the solid initial caking piece is convenient to be free from sticking to the scraper and can naturally slide; the inner surface of the scraper is made of ceramic composite material, so that the surface smoothness is high, and the solid initial caking piece can slide to the lowest part under the action of self gravity. Ceramic composite materials are known in the art. The outer side of the lower part of the shell 1-1 is provided with a heating system, the heating system adopts steam for heating, the temperature of the liquid caprolactam is kept at 80-85 ℃ by the heating system, the liquid caprolactam is convenient to crystallize by utilizing the temperature difference, and the crystallization temperature is about 69 ℃. The cavity between the rotary drum 1-2 and the shell 1-1 of the rotary drum sheeting machine 1 is filled with dry air for preventing sheeting from adhering together. The air outlet end of the drying tail gas is connected with a dust remover 19 for removing dust from the dried tail gas, and the tail gas after dust removal enters a discharge system for discharge.
In the invention, the cooling medium introduced into the inner cavity of the rotary drum can also adopt cold air, for example: adopts the freezing principle of Freon air conditioner to enter ultralow temperature cold air to crystallize liquid caprolactam instantaneously.
When the rotary drum flaker works, caprolactam liquid materials enter a liquid material pool between the rotary drum 1-2 and the shell 1-1 through a feed inlet on the shell 1-1 of the rotary drum flaker 1, the lower part of the rotary drum 1-2 of the rotary drum flaker 1 is immersed in the liquid material pool containing the liquid materials, and cooling medium is introduced into the rotary drum 1-2 of the rotary drum flaker 1. The rotary drum 1-2 rotates under the action of the rotary drum driving motor 1-4, the material is carried out from the liquid material pool along with the uniform rotation of the rotary drum surface by utilizing the tension of the material liquid surface and the adhesion between the material and the rotary drum surface, a layer of film product with uniform thickness is formed on the outer surface of the rotary drum, and the temperature of the material is rapidly cooled to a solidifying point and solidified through the temperature difference between the material on the outer surface of the rotary drum and the cooling medium in the rotary drum. When the drum 1-2 is turned to the position of the doctor blade 1-3, the film product, which has solidified to a solid, is scraped off in the form of a sheet by the doctor blade 1-3. When the rotary drum flaker works, dry air is introduced into the rotary drum flaker to dry the flakers, the dried tail gas is dedusted by a deduster 6, and the dedusted tail gas enters an emission system to be emitted.
As shown in fig. 3 and 6-8, in this embodiment, a bin 14 is disposed below the discharge port corresponding to the housing 1-1, and a crushing device for crushing solid agglomerate and a screen 16 for filtering agglomerate powder are disposed in the bin 14. The crushing device comprises a motor 17 and a roller cutter 15, wherein the motor 17 is fixed on the upper part of a shell 1-1 of the flaker, a screen 4 is fixedly arranged in a storage bin 14 and is positioned on the lower part of the roller cutter 15, the upper part of a cutter bar of the roller cutter 15 is connected with an output shaft of the motor 17, and the lower part of the cutter bar of the roller cutter 15 is rotationally connected with the center point of the screen 16. The roller blade 15 comprises at least one layer of spiral blades 15-1 which are axially arranged at intervals along the cutter bar, each spiral blade 15-1 is provided with two spiral blades which are arranged at an included angle of 180 degrees, and the rotation directions of the two blades are consistent. The two blades of the spiral blade 15-1 can be horizontally arranged blades, in order to improve the crushing effect of the crushing device, in this embodiment, the spiral blade 15-1 is preferably arranged in an inclined manner, the inclined angle is 15-30 degrees, the two blades of the spiral blade 15-1 are different in height, namely, the height of one blade is higher than that of the other blade, and the two blades are provided with downward or upward bending radians, so that the blades can form turbulent flow in the rotating process of the roller blade, the spiral blade is convenient for fully crushing the blades, the two blades of the spiral blade which are obliquely arranged are respectively positioned at different heights, crushing of the blades at different positions is facilitated, and the roller blade can perform multiple crushing treatment on the blades at the upper part along with falling of the qualified blade powder at the position of the filter screen. The spiral blade 15-1 provided on the roller blade 15 may be a plurality of layers, and preferably the roller blade 15 includes the spiral blade 15-1 of the upper and lower layers. The initial solid caking pieces with uneven sizes entering the storage bin 14 can be crushed through the roller cutters 15 arranged in the storage bin 14, the solid caking pieces can be crushed for a plurality of times through the structural design of the roller cutters 15, and caking piece powder with qualified granularity falls down from the filter screen 16.
The bin 14 in this embodiment is disposed below the discharge port of the flaker, and this arrangement requires a feeding mechanism, for example, a feeding screw 2 is disposed in this embodiment, and the solid flaker scraped by the scraper is sent into the bin 14 by the feeding screw 2.
As shown in fig. 9-10, the bin 14 may also be disposed inside the discharge port of the housing 1-1 of the drum flaker 1, i.e., moved upward relative to the position where the bin 14 was disposed in the previous embodiment, the lower end of the scraper 1-3 extends above the bin 14, the screen 16 is rotatably disposed in the bin 14 below the roller blade 15, the screen 16 is omega-shaped, and the lower portion of the screen 16 is provided with a motor 18 connected thereto. The motor 18 is mounted on a bracket that is fixedly connected to the inner wall of the bin 14. The screen 16 is rotated by a motor 18. The direction of rotation of the screen 16 may be the same as the direction of rotation of the roller blade 15 or the direction of rotation of the screen 16 may be opposite to the direction of rotation of the roller blade 15. The arrangement mode of the bin 14 in the embodiment is convenient for the solid-state caking pieces scraped by the scraper to directly fall into the bin for crushing treatment, so that a feeding mechanism can be omitted, and equipment configuration is reduced. When the rotation direction of the screen 16 is the same as that of the roller blade 15, the solid initial caking pieces scraped by the scraper enter the screen 16 in the storage bin, the solid caking pieces are crushed through the rotation of the roller blade 15, and caking piece powder with qualified granularity can quickly enter the lower part of the storage bin under the action of centrifugal force to wait for the next calculation bagging operation; when the rotation direction of the screen 16 is opposite to that of the roller knife 15, the initial solid caking piece can naturally form spiral flow, at the moment, the spiral knife blades are horizontally arranged, the initial solid caking piece with the size can be easily broken, and the caking piece powder with qualified granularity can quickly enter the storage bin under the action of centrifugal force to wait for the next calculation bagging operation.
As shown in fig. 11 to 13, a cleaning mechanism 21 may be provided on the blade for facilitating cleaning of the blade. The cleaning mechanism 21 comprises a cleaning motor 21-1, a gear 21-2 and a scraping plate 21-3, wherein the cleaning motor 21-1 is an outer rotor motor, and the gear 21-2 is connected with a rotor of the cleaning motor 21-1 into a whole. The utility model discloses a scraper, including scraper 1-3, motor shaft, rack 1-3, spacing baffle 1-6, rack 1-5 and spacing baffle 1-6 are provided with in the outside end of scraper 1-3, and rack 1-5 sets up along the internal surface of scraper 1-3, and spacing baffle 1-6 vertically sets up in the outside end of scraper 1-3, is provided with the guide way on spacing baffle 1-6, and the one end of the motor shaft of cleaning motor 21-1 is movably set up in the guide way of spacing baffle 1-6, has the boss on the motor shaft and is used for playing spacing and guiding action, and the tip of spacing baffle 1-6 sets up detachable end plate, is convenient for the motor shaft to install in the guide way. The gear 21-2 is meshed with the rack 1-5, a rotor shaft or a gear shaft end at the other end of the cleaning motor 21-1 is supported in the bearing shell 21-8 through a bearing, an auxiliary supporting rod 21-10 is fixedly connected to the lower part of the bearing shell 21-8, polyurethane or other elastic materials are connected to the lower part of the auxiliary supporting rod 21-10, and the auxiliary supporting rod 21-10 is used for enabling the outer diameter of the bearing to be relatively fixed. One end of the scraper connecting rod 21-9 is fixedly connected with the end face of the bearing shell 21-8, the other end of the scraper connecting rod 21-9 is connected with the electric cylinder 21-4, the other end of the electric cylinder 21-4 is connected with the scraper 21-3, and the scraper 21-3 can be in contact with the inner surface of the scraper 1-3. When the cleaning mechanism works, under the drive of the cleaning motor 21-1, the gear 21-2 is meshed with the rack 1-5 to drive the scraper 21-3 to move along the scraper, and the scraper 21-3 cleans the surface of the scraper in the moving process. The cleaning motor 21-1 is controlled by a motor TCU, and the electric cylinder 21-4 is controlled by an electric cylinder controller ECU. The ECU is communicated with the motor TCU, when the cleaning motor 21-1 rotates forwards, the electric cylinder 21-4 extends to enable the scraper 21-3 to move to the lower end to be in contact with the scraper 1-3 so as to clean the surface of the scraper, when the cleaning motor 21-1 rotates backwards, the electric cylinder controller obtains a signal, the electric cylinder 21-4 is shortened, and the scraper 21-3 moves upwards to be separated from the surface of the scraper 1-3 so as not to clean. When the cleaning machine is not in cleaning, the cleaning mechanism stands by at the highest point. In order to prevent the cleaning mechanism from being overturned, a limiting structure can be arranged on the scraper to limit the cleaning mechanism.
The double-screw automatic weighing and packaging machine 3 is used for quantitatively weighing and bagging the solid caprolactam. It is the prior art and commercially available.
The main belt conveyor 5 is used for conveying the package, which is the prior art.
The automatic heat sealing machine 4 is used for sealing the bag mouth of the packaging bag. The automatic heat sealing machine in the embodiment is purchased from the market, and is purchased from Changzhou Hee fine engineering automation equipment Limited company. The packaging bag is sealed at the opening by an automatic heat sealing machine 4 in the conveying process of the main belt conveyor 5.
The automatic bag inverting conveyor 6 is used to change the package from a vertical state to a flat state during the package conveying process. The automatic bag pouring conveyor 6 comprises a belt conveyor and a bag pouring mechanism arranged on the belt conveyor, and the packaging bag is converted from a vertical state to a flat state through the bag pouring mechanism in the conveying process of the packaging bag on the belt conveyor. The automatic bag inverting conveyor 6 in this embodiment is purchased from the Changzhou, stock, and fine automation equipment limited.
The slope conveyor 7 is a belt conveyor and is used for conveying the packaging bags conveyed by the automatic bag pouring conveyor to the weight rechecking machine 8 for weight rechecking.
The weight rechecking machine 8 is used for rechecking the weight of the packaging bag, which is the prior art and is commercially available. The weight review machine in this embodiment is purchased from the Changzhou stock fine automation equipment company limited.
The automatic removing machine 9 is used for removing unqualified packaging bags from the conveying belt. The automatic removing machine 9 mainly comprises a roller way and a removing mechanism, and can automatically remove the packaging bags with excessive weight, which is the prior art and can be obtained from market purchase. The automatic culling machine 9 in this embodiment is purchased from the resident fine automation equipment limited in the state of the home.
The automatic vibrating and leveling conveyor 10 is used for vibrating and leveling and shaping the qualified packaging bags, and is beneficial to subsequent stacking. The automatic vibratory flattening conveyor 10 includes a belt conveying portion and a vibrating portion, and flattening of the package is accomplished primarily by pressing the bag wheels and vibrating conveyor. The automated vibratory finishing conveyor in this embodiment was purchased from the Changzhou, stock, fine automation equipment, inc.
The unpowered conveyer 11 is mainly used for conveying packaging bags to be stacked, adopts a roller way structure, and rollers are free rollers.
The caprolactam sheeting production process method comprises the following steps:
(1) The liquid caprolactam is conveyed into a cavity between a shell 1-1 of a rotary drum flaker 1 and a rotary drum 1-2 through a conveying pump from a storage tank 13, the lower part of the rotary drum 1-2 of the rotary drum flaker 1 is in contact with the liquid caprolactam in the cavity, a cooling medium is introduced into the rotary drum 1-2 of the rotary drum flaker 1, the liquid caprolactam is adhered to the surface of the rotary drum 1-2 when the rotary drum 1-2 of the rotary drum flaker 1 rotates, the material adhered to the outer surface of the rotary drum 1-2 is cooled to a solidifying point and solidified through the temperature difference between the material on the outer surface of the rotary drum 1-2 and the cooling medium in the rotary drum 1-2, and the solid caprolactam on the surface of the rotary drum 1-2 is scraped in a flake form through a scraper 1-3 when the rotary drum 1-2 continues to rotate to the scraper 1-3 of the rotary drum flaker 1; when the liquid caprolactam is conveyed into the rotary drum flaker 1 from the storage tank 13, a hot water system is adopted for heat tracing, the hot water temperature is 90 ℃, and the temperature of the liquid caprolactam is 80-85 ℃; drying air is introduced into a cavity between the shell 1-1 of the rotary drum sheeting machine 1 and the rotary drum 1-2, and is used for preventing sheeting from being bonded together;
(2) The caprolactam slices scraped by the scraper 1-3 are sent into a bin 14 through a feeding screw 2 to be crushed and filtered, caprolactam powder with qualified granularity is weighed through a double-screw automatic weighing and packaging machine 3, and the weighed slices are filled into packaging bags;
(3) The packaging bag with the knots is conveyed to a main belt conveyor 5 by a conveying belt for conveying, and the opening of the packaging bag is sealed by an automatic heat sealing machine 4 in the conveying process of the packaging bag;
(4) The sealed packaging bags are continuously conveyed forwards to an automatic bag pouring conveyor 6, the packaging bags are converted into a flat state from a vertical state through a bag pouring mechanism of the automatic bag pouring conveyor 6, the packaging bags are continuously conveyed forwards by the automatic bag pouring conveyor 6, the weight of the packaging bags is rechecked by a weight rechecking machine 8 through a slope conveyor 7, the packaging bags with qualified weight are continuously conveyed forwards to an automatic vibration flattening conveyor 10 through an automatic removing machine 9, the qualified packaging bags are subjected to vibration flattening processing through the automatic vibration flattening conveyor 10, the processed packaging bags are conveyed to an unpowered conveyor 11, and stacking processing is performed manually; and after the unqualified packaging bags with the weight are conveyed to the automatic rejecting machine 9, rejecting the unqualified packaging bags through a rejecting mechanism of the automatic rejecting machine 9.
When the drum flaker 1 and the bin 14 adopt the structures shown in fig. 9-10, caprolactam flakes scraped by the scraper directly enter the bin 14 for crushing and filtering, caprolactam powder with qualified granularity is sent into a double-screw automatic weighing and packaging machine for weighing, and the weighed flakes are filled into a packaging bag.
Other parts in this embodiment are all of the prior art, and are not described herein.
Claims (8)
1. A caprolactam caking production process method is characterized in that: the method comprises the following steps:
(1) The liquid caprolactam is conveyed into a cavity between a shell of the rotary drum flaker and the rotary drum through a conveying pump, the lower part of the rotary drum flaker is contacted with the liquid caprolactam in the cavity, a cooling medium is filled in the rotary drum of the rotary drum flaker, the liquid caprolactam is adhered to the surface of the rotary drum when the rotary drum of the rotary drum flaker rotates, the material adhered to the outer surface of the rotary drum is cooled to a solidifying point and solidified through the temperature difference between the material on the outer surface of the rotary drum and the cooling medium in the rotary drum, and when the rotary drum continuously rotates to a scraper position of the rotary drum flaker, the solid caprolactam on the surface of the rotary drum is scraped in a sheet form through a scraper;
(2) Feeding caprolactam slices scraped by the scraper into a double-screw automatic weighing packaging machine for weighing, and filling the weighed slices into a packaging bag;
(3) Conveying the packaging bags with the knots on a conveying belt, and sealing the packaging bags through a heat-sealing machine;
(4) The sealed packaging bag is continuously conveyed forwards through a conveying belt and sequentially passes through a bag pouring mechanism, a weight rechecking machine, an automatic removing machine, an automatic vibration flattening and shaping machine and an unpowered conveyor, wherein the bag pouring mechanism changes the packaging bag from a vertical state to a flat state, the weight rechecking machine rechecks the weight of the packaging bag, the automatic removing machine removes unqualified packaging bags from the conveying belt, and the automatic vibration flattening and shaping machine performs vibration flattening and shaping on the qualified packaging bags;
in the step (1), drying air is introduced into a cavity between a shell of the rotary drum flaker and the rotary drum;
the scraper of the rotary drum flaker is spiral and is consistent with the curved surface of the rotary drum, the enveloping degree of the scraper to the rotary drum is 150-180 degrees, the lower end of the scraper is positioned at one side of a discharge hole of the rotary drum flaker, the scraper is a single-sided cutting edge, the cutting edge is higher than the inner surface of the scraper, and the inner surface of the scraper is made of ceramic composite materials;
the solid caprolactam on the surface of the rotary drum is scraped by sequentially contacting the film product on the surface of the rotary drum from the upper end to the lower end.
2. The process for producing caprolactam flake according to claim 1, wherein the process is characterized in that: when the liquid caprolactam is conveyed into the rotary drum sheeting machine from the storage tank, a hot water system is adopted for heat tracing, the hot water temperature is 90 ℃, and the temperature of the liquid caprolactam is 80-85 ℃.
3. The process for producing caprolactam flake according to claim 1, wherein the process is characterized in that: the cooling medium is chilled water or cold air.
4. The process for producing caprolactam flake according to claim 1, wherein the process is characterized in that: caprolactam caking piece scraped by the scraper is firstly sent into a bin arranged on the upper part of the double-screw automatic weighing packaging machine for crushing and filtering, and caprolactam powder with qualified granularity is then sent into the double-screw automatic weighing packaging machine for weighing.
5. The process for producing caprolactam flake according to claim 4, wherein the process comprises the following steps: be provided with reducing mechanism and screen cloth in the feed bin, the screen cloth sets up in reducing mechanism's lower part, and reducing mechanism includes the roller sword that drives the rotation by the motor, is provided with at least one helical blade along its axial interval on the cutter arbor of roller sword, every helical blade has two and is 180 heliciform blades that the contained angle set up, and the rotation of two blades is unanimous, and the difference in height that two blades were located, and the blade has the radian of downwarping or upwards bending.
6. The process for producing caprolactam flake according to claim 5, wherein the process comprises the following steps: caprolactam caking piece scraped by the scraper directly falls into the bin for crushing treatment.
7. The process for producing caprolactam flake according to claim 6, wherein the process comprises the steps of: the screen cloth rotationally sets up in the feed bin, and the screen cloth is omega shape, and the rotation direction of screen cloth is opposite with the rotation direction of roller sword, when the roller sword rotates, the screen cloth counter-rotates simultaneously.
8. The process for producing caprolactam flake according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7, characterized in that: the cleaning device comprises a scraper, wherein the scraper is provided with a cleaning mechanism (21), the cleaning mechanism (21) comprises a cleaning motor (21-1), a gear (21-2) driven by the cleaning motor (21-1) and a scraper (21-3), the outer side end of the scraper (1-3) is provided with a rack (1-5) and a limiting guide plate (1-6), the limiting guide plate (1-6) is provided with a guide groove, one end of a motor shaft of the cleaning motor (21-1) is movably arranged in the guide groove of the limiting guide plate (1-6), the gear (21-2) is connected with a rotor of the cleaning motor (21-1) into a whole, the gear (21-2) is meshed with the rack (1-5), the other end of the cleaning motor (21-1) is supported in a bearing shell (21-8) through a bearing, the lower part of the bearing shell (21-8) is provided with an auxiliary supporting rod (21-10), one end of a connecting rod (21-9) is fixedly connected with the end face of the bearing shell (21-8), and the other end of the connecting rod (21-9) is connected with the scraper cylinder (3) through the electric motor (21-4), and the other end of the connecting rod (21-9) can be contacted with the scraper (3) in the surface of the scraper cylinder (21-3); when the cleaning motor (21-1) rotates positively, the electric cylinder (21-4) stretches to enable the scraper (21-3) to move to the lower end to be in contact with the scraper (1-3) so as to clean the surface of the scraper, when the cleaning motor (21-1) rotates reversely, the electric cylinder (21-4) shortens, and the scraper (21-3) moves upwards to be separated from the surface of the scraper (1-3) so as not to clean the surface of the scraper.
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| CN210096980U (en) * | 2019-02-27 | 2020-02-21 | 南京合创工程设计有限公司 | Liquid caprolactam sheeting energy-saving complete equipment |
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